If my CYA is 100 and my Chlorine is between 8-10 is that safe or do I need to drain some out and refill?
Question about CYA and Chlorine levels
- Thread starter Nancy_Ann
- Start date
Welcome!
You may have more than 100 PPM CYA. I would do a test of 1/2 pool water and 1/2 tap water and test and then multiply that number by 2. This means to fill the sample bottle to the 7 ml mark and then carefully pour out half and then add tap water and the proceed with the CYA test as normal. Post a full set of numbers and then we can provide more accurate information. Either way, a drain and refill is in probably in your future, but with an accurate reading, you can know how much to drain.
You may have more than 100 PPM CYA. I would do a test of 1/2 pool water and 1/2 tap water and test and then multiply that number by 2. This means to fill the sample bottle to the 7 ml mark and then carefully pour out half and then add tap water and the proceed with the CYA test as normal. Post a full set of numbers and then we can provide more accurate information. Either way, a drain and refill is in probably in your future, but with an accurate reading, you can know how much to drain.
A week ago you posted that you were registering 0 CYA, how did your go from zero to 100 in a week?
I guess you didn't actually say your CYA was 100, so perhaps it's just a hypothetical question. In any case, if your CYA is 100 your FC should be 7-12 ppm. See http://www.troublefreepool.com/content/128-chlorine-cya-chart-slam-shock.
Donldson, last week I tested my pool's CYA and it was registering below 30. That's all I could guess at due to the test kit I had. I bought stabilizer and followed the directions to raise my CYA by 20ppm and yesterday I was reading 100! I added the stabilizer sometime last week, though I'm not sure exactly what day it was.
- - - Updated - - -
Amail, I did go to that article. It said that those levels were NOT recommended. That's why I asked if it was safe to swim in.
Anyway, thanks for your help everyone.
- - - Updated - - -
Amail, I did go to that article. It said that those levels were NOT recommended. That's why I asked if it was safe to swim in.
Anyway, thanks for your help everyone.
Oh boy... Maybe a dilution will see if you're past 100.
Measuring is key when doing the TFPC. If you have a helper, make sure you're not working against each other n adding too much of the same thing.
Measuring is key when doing the TFPC. If you have a helper, make sure you're not working against each other n adding too much of the same thing.
- Jun 22, 2014
- 47,752
- Pool Size
- 17888
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool RJ-45 Plus
Well NancyAnn, unfortunately .. however it happened ... your CYA went too high. 
Not to worry, it's not the worse thing that could happen. But to answer your original question, "yes" you should do a partial drain to lower the CYA back down a bit. If your water is currently clear and in good shape, maybe drain about 1/4 or so to see if that gets it down to around 75 or so. The sun and heat in our regional area is tough, and your pool is somewhat small (warms-up fast), so the relatively high CYA will provide additional protection to your chlorine.
Not to worry, it's not the worse thing that could happen. But to answer your original question, "yes" you should do a partial drain to lower the CYA back down a bit. If your water is currently clear and in good shape, maybe drain about 1/4 or so to see if that gets it down to around 75 or so. The sun and heat in our regional area is tough, and your pool is somewhat small (warms-up fast), so the relatively high CYA will provide additional protection to your chlorine.
